The label is seeking $150,000 for each instance of infringement, plus an injunction to stop Phan's use of the songs.

There were 50 examples of "blatant copyright infringement" in the suit, which added that the label's "analysis is still preliminary, and the full extent of Phan's infringement has not yet been determined".

However, a spokesman for Phan told BBC News that the suit "lacks any merit".

"Ultra agreed to allow Michelle to use the music and Michelle intends to fight this lawsuit and bring her own claims against Ultra," he said.

"Michelle's intention has always been to promote other artists, creating a platform for their work to be showcased to an international audience."

Phan started posting YouTube videos in 2007 and her Barbie Transformation Tutorial video has been viewed more than 55 million times.

Grammy-nominated DJ Kaskade was referred to in the lawsuit, but defended Phan on Twitter.

"Summary: I'm not suing @MichellePhan + @ultrarecords isn't my lapdog. I can't do much about the lawsuit except voice support for her," he tweeted.

"I find that @MichellePhan has great taste in music *ahem*, and knows secrets on how to make my eyes really POP. What's not to like?"